William e



(No Model.)

W. R. WALTON.

MOLD FOR OASTING COPPER INGOTS.

Patented Apr. 7, 1885.

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UNITED STATES PATENT OFFICE.

WILLIAM R. WALTON, OF 'ANSONIA, CONNECTICUT, ASSIGNOR TO THE AN- SONIABRASS AND COPPER COMPANY, OF SAME PLACE.

MOLD FOR CASTING COPPER INGOTS.

SPECIFICATION forming part of Letters Patent No. 315,192, dated April'7, 1885.

Application filed December 22, 1884.

To all whom it may concern.-

Be it known that I, WILLIAM ROBERT WAL- roN, a citizen of Great Britain,residing in Ansonia, in the county of New Haven and State ofConnecticut, have invented an Improvement in Molds for Casting CopperIngots, of which the following is aspecification.

In casting copper ingots, especially tubular ingots, great difficultyhas been experienced in producing perfectly sound ingots. Several causeshave conspired to this end. The metal has usually been poured in througha gate, and the mold is filled up and the metal in the mold and in thegate remain as one, and the portion in the gate becoming chilledsuspends the ingot, and the contraction causes the ingot to be lifted,and the copper beingin a partially-hardened condition is injured orcracked. This injurious effect is increased by the small fins that arethrown off from the ingot into the partially-open joint between theparts of the mold.

The object of my invention is to prevent the formation of fins upon theingot, to allow the casting to contract, and to supply to the top of theingot a surplus amount of copper, so that the heat of the copper at thetop of the ingot may be increased or maintained after the mold is full,thereby allowing the lower part of the ingot to chill or contract whilethe upper part of the metal is in a fluid condition.

In the drawings, Figure 1 is a vertical section of the mold, and Fig. 2is a sectional plan of the same at the line 00 as.

The mold is of the proper size and shape. It is usually circular andtapering, the upper part being of less diameter than the lower part, toallow the ingot to shrink and settle as the metal solidifies. The moldis made in two parts, a b, the edges of which are made to interlock at cc, as usual, with the exception that the edges of the metal, instead ofcoming together flat and parallel to each other, are beveled backwardly,so that only the metal parts at the inner surface of the mold cometogether like two knife-edges.

In preparing the mold for the melted copper the beveled edges of themold are luted with a putty of china-clay, and the interior surfacepainted or smeared over with chinacay mixed with oil, and then dustedwith finely-pulverized charcoal. When the two (No model.)

half-molds are put together, the luting upon the beveled edges ispressed backwardly and 5 5 the joint is closed entirely tight. Shouldthere be any clay that is pressed inwardly, the beveled knife-edges nipoff the luting and it falls away. The gate h at the top of the mold isof ordinary character, and at oneside 6Q of the mold there is anoverflow-opening, 1'. When the ingot is to be tubular, a core, 1, ismade of loam in the usual way, but it is coated with a mixture ofchina-clay and pulverized charcoal. The clay is entirely impervious tothe melted copper, and under the action of heat it contracts as thecarbon burns out; and hence the core shells out of the casting easilywhen the ingot is cold, thus dispensing with the old scraping process.When the copper is poured into the mold, the same gradually rises, thecharcoal of the lining burns, and any pieces of luting float, and whenthe mold is full the surplus, instead of accumulating in the gate, runsoff by the over 7 5 flow-opening i, and the pouring is preferablycontinued until the ingot has partially cooled or contracted at thelowerend. This prevents the ingot being suspended by the gate, and allowssuch ingot to contract in the mold and remain solid and free from cracksand imperfections.

I claim as my invention- 1. The ingot-mold having the interlocking edgesbeveled backwardly from the inner surface of the mold to receive theluting, and an overflow-opening at the top of the mold, substantially asset forth.

2. The mold for copper ingots formed of metal and having a surface ofchina-clay and oil, and a dressing of finely-pulverized charcoal, as andfor the purposes set forth.

3. A tapering mold for copper ingots having the largest end at thebottom to allow the ingot to contract downwardly, and a lateral escapebetween the pouring-gate and the top of the ingot-mold for allowing thecopper to overflow, substantially as and for the purposes specified.

Signed Joy me this 15th day of December, A. D. 1884..

WILLIAM R. \VALTON.

Witnesses:

A. S. TERRY, J OHN W. DREW.

